In article <19961123162800.LAA26253 at ladder01.news.aol.com>,
rcjohnsen at aol.com wrote:
@ Relevant experiments have been done in mice by a number of groups. It is
@ possible to recognize male and female pronuclei in fertilized eggs. If
@ male pronuclei are removed and replaced by a male pronucleus from another
@ fertilized egg and the surgically treated egg implanted in a surrogate
@ mother, it results in viable offspring. However, combinations of two
@ female pronuclei or two male pronuclei don't work. Neither do
@ combinations of a female pronucleus and the 2nd polar body. It may be
@ related to genetic imprinting.
I recall from dev. biol lectures that two frog oocytes can be fused to
generate a viable embryo. Is this true, and if so at what point in
phylogeny does imprinting have an influence? Just curious.
:-Peter